Irawan, A.P., Department of Mechanical Engineering, University of Indonesia, Jakarta, Indonesia, University of Tarumanagara, Jakarta, Indonesia; Soemardi, T.P., Department of Mechanical Engineering, University of Indonesia, Depok, Indonesia; Widjajalaksmi, K., Faculty of Medicine, University of Indonesia, Jakarta, Indonesia; Reksoprodjo, A.H.S., Department of Mechanical Engineering, University of Indonesia, Depok, Indonesia